System time is 20 minutes behind even when ntp is used.

Solution Verified - Updated -

Issue

  • There are four Java application servers running in our production environment. They are all pointed to the same switch to sync time, all four have the same ntp.conf with the same permissions.
  • Time is accurate on two servers however two run 20 minutes behind.

Environment

  • Red Hat Enterprise Linux 5.7
  • ntp-4.2.2p1-15.el5_7.1

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